The Eterna Calibre 12821 stands as a pinnacle of mid-20th-century Swiss engineering, captivating vintage watch enthusiasts and hobbyist watchmakers with its robust automatic design. Rooted in Eterna’s legacy of innovation, this movement powered countless dress and sports watches from the 1960s onward, prized for its reliability and smooth operation.
Historical Context
Introduced during Eterna’s golden era of self-winding innovations, the 12821 evolved from base ETA architectures like the 2824 but incorporated proprietary enhancements. It epitomized the brand’s Eterna-Matic system, emphasizing bi-directional winding for effortless daily wear. Collectors seek it in models like vintage Kontiki divers or elegant KonTiki chronographs, where its durability shines through decades of service.
Technical Specifications
Type: Automatic, self-winding with sweep seconds hand
Diameter: 11.5 lignes (25.6 mm)
Height: 4.6 mm
Jewels: 17 (main bearings) / 25 total
Frequency: 28,800 vibrations per hour (4 Hz)
Power Reserve: Approximately 40 hours
Functions: Hours, minutes, central seconds; optional date at 3 o’clock
Winding: Bi-directional rotor via Eterna-Matic system
Shock Protection: Eterna-U or Incabloc equivalents
Balance: Glucydur with Nivarox hairspring
For any Watch Spare Parts inquiry, Email us for rate and availability: [email protected]
Watch Parts Enquiry
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Stem, Crown, Hands & Spares might be available for this movement.
Email us for rate and availability: [email protected]
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